Some people in a hotel are dropping water balloons from their open window on to the ground below. The balloons take 0.15 s to pass your 1.6-m-tall window. Where should security look for the raucous hotel guests?

Security should look for the raucous hotel guests at height of   meters

Explanation:

Given

Height of the window meters

Time taken by balloon to pass the window seconds

As per second law of motion for objects moving upward

Substituting the given values we get -

u =

Security should look for the raucous hotel guests at height

Here

Substituting the values in above equation, we get -

Security should look for the raucous hotel guests at height of   meters

option number c is the right answer.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.